Defect-induced perturbation on the 1/3 ML Sn-Si(111) surface: A voltage-dependent scanning tunneling microscopy study

L. Ottaviano, G. Profeta, A. Continenza, S. Santucci, Arthur J Freeman, S. Modesti

Research output: Contribution to journalArticle

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Abstract

We have measured the amplitude of the damped periodic lattice response to substitutional Si defect sites on the 1/3 ML Sn-Si(111) surface at room temperature by means of voltage-dependent scanning tunneling microscopy experiments. This perturbation, which in the case of Si defects mainly shows up as an increased apparent height of the defect first neighbors, is strongly voltage dependent and vanishes when tunneling at very low voltages (approximately 10 mV), both in filled and empty state images. The observed energy dependence is justified by the vertical hybridization of the surface dangling bond states at the Fermi level and by vertical charge rearrangement between the Sn adatoms and the subsurface Si atoms directly below the T4 site.

Original languageEnglish
Pages (from-to)57-67
Number of pages11
JournalSurface Science
Volume464
Issue number2-3
DOIs
Publication statusPublished - Oct 1 2000

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Scanning tunneling microscopy
scanning tunneling microscopy
perturbation
Defects
defects
Electric potential
electric potential
Dangling bonds
Adatoms
Fermi level
low voltage
adatoms
Atoms
room temperature
atoms
Experiments
Temperature
energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Defect-induced perturbation on the 1/3 ML Sn-Si(111) surface : A voltage-dependent scanning tunneling microscopy study. / Ottaviano, L.; Profeta, G.; Continenza, A.; Santucci, S.; Freeman, Arthur J; Modesti, S.

In: Surface Science, Vol. 464, No. 2-3, 01.10.2000, p. 57-67.

Research output: Contribution to journalArticle

Ottaviano, L. ; Profeta, G. ; Continenza, A. ; Santucci, S. ; Freeman, Arthur J ; Modesti, S. / Defect-induced perturbation on the 1/3 ML Sn-Si(111) surface : A voltage-dependent scanning tunneling microscopy study. In: Surface Science. 2000 ; Vol. 464, No. 2-3. pp. 57-67.
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